原创 D - Nim POJ - 2068 (記憶化搜索）
Let's play a traditional game Nim. You and I are seated across a table and we have a hundred stones on the table (we kn
2019-05-21 13:37:24
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原创 A - Beautiful numbers CodeForces - 55D
Volodya is an odd boy and his taste is strange as well. It seems to him that a positive integer number is beautiful if
2019-05-21 13:37:24
原创 B2. Cat Party (Hard Edition)（思維）
This problem is same as the previous one, but has larger constraints. Shiro's just moved to the new house. She wants to
2019-05-11 16:16:05
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原创 F. Graph Without Long Directed Paths
You are given a connected undirected graph consisting of 𝑛 vertices and 𝑚 edges. There are no self-loops or multiple ed
2019-05-04 15:27:58
原创 C. Division and Union
There are 𝑛 segments [𝑙𝑖,𝑟𝑖] for 1≤𝑖≤𝑛 . You should divide all segments into two non-empty groups in such way that ther
2019-05-04 15:27:58
原创 I - Induced Metric Space Gym - 102190I
題目鏈接：http://codeforces.com/gym/102190/attachments 題解：先按照題目要求遍歷一下數組，若存在不滿足題目要求的直接輸出NO，其他的：先將主對角線上的元素變爲0，若存在對稱方面，如果一方面可變化
2019-05-02 14:31:57
原创 G - Green-Red Tree Gym - 102190G
題目鏈接：http://codeforces.com/gym/102190/attachments 題解：我們先將前5個點分別塗上紅色或者綠色，使得這兩棵樹在5個點中都是連通，並不存在自環。那麼從第6個點開始：分別找一個固定的點與該點連邊
2019-05-02 14:31:57
原创 C - 不要62 HDU - 2089
杭州人稱那些傻乎乎粘嗒嗒的人爲62（音：laoer）。 杭州交通管理局經常會擴充一些的士車牌照，新近出來一個好消息，以後上牌照，不再含有不吉利的數字了，這樣一來，就可以消除個別的士司機和乘客的心理障礙，更安全地服務大衆。 不吉利的數字爲所
2019-05-02 14:31:57
原创 E. Minimum Array(multiset暴力）
You are given two arrays aa and bb, both of length nn. All elements of both arrays are from 00 to n−1n−1. You can reord
2019-05-01 00:57:56
原创 I - Interesting Numbers URAL - 2070
Nikolay and Asya investigate integers together in their spare time. Nikolay thinks an integer is interesting if it is a
2019-04-25 14:30:32
原创 P - A Dangerous Maze (II) (期望）
You are in a maze; seeing n doors in front of you in beginning. You can choose any door you like. The probability for c
2019-04-23 13:54:52
原创 C. Serval and Parenthesis Sequence（合法括號序列）
Serval soon said goodbye to Japari kindergarten, and began his life in Japari Primary School. In his favorite math clas
2019-04-23 13:54:52
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原创 E. Two Teams
There are nn students standing in a row. Two coaches are forming two teams — the first coach chooses the first team and
2019-04-18 13:39:03
原创 G - Dice (III)
Given a dice with n sides, you have to find the expected number of times you have to throw that dice to see all its fac
2019-04-16 13:39:47